The WEFTA contributors and the editors wish to acknowledge
that compilation and publication of this Guide was supported by a Sponsorship
Grant from the Commission of the European Communities under the FAR Coordinated
Actions Programme.

The expert inputs of the members of the WEFTA Working Group on
Analytical Methods are greatly acknowledged, and the Working Group acknowledges
the continuing support of the respective laboratories and, particularly, the
help received at relatively short notice from the Polish and Greek
laboratories.